mirror of
https://github.com/nothings/stb
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Merge branch 'stb-image-writer-memory' of https://github.com/callidus/stb into work2
This commit is contained in:
Sean Barrett
commit
019236a624
@ -1,4 +1,4 @@
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/* stb_image_write - v0.97 - public domain - http://nothings.org/stb/stb_image_write.h
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/* stb_image_write - v0.98 - public domain - http://nothings.org/stb/stb_image_write.h
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writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010
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no warranty implied; use at your own risk
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@ -9,6 +9,10 @@
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in the file that you want to have the implementation.
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You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
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And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
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You can optionally define STBI_MEMMOVE and STBI_MEMCPY if the default semantics of
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memmove and memcpy would be incompatible with your choice of malloc et al.
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Will probably not work correctly with strict-aliasing optimizations.
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@ -32,7 +36,7 @@ USAGE:
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int stbi_write_hdr(char const *filename, int w, int h, int comp, const void *data);
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Each function returns 0 on failure and non-0 on success.
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The functions create an image file defined by the parameters. The image
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is a rectangle of pixels stored from left-to-right, top-to-bottom.
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Each pixel contains 'comp' channels of data stored interleaved with 8-bits
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@ -45,7 +49,7 @@ USAGE:
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PNG creates output files with the same number of components as the input.
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The BMP format expands Y to RGB in the file format and does not
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output alpha.
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PNG supports writing rectangles of data even when the bytes storing rows of
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data are not consecutive in memory (e.g. sub-rectangles of a larger image),
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by supplying the stride between the beginning of adjacent rows. The other
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@ -67,6 +71,8 @@ CREDITS:
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Jean-Sebastien Guay
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Bugfixes:
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Chribba@github
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STBI_MALLOC etc:
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callidus@github
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*/
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#ifndef INCLUDE_STB_IMAGE_WRITE_H
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@ -93,9 +99,29 @@ extern int stbi_write_hdr(char const *filename, int w, int h, int comp, const fl
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <math.h>
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#if defined(STBI_MALLOC) && defined(STBI_FREE) && defined(STBI_REALLOC)
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// ok
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#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC)
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// ok
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#else
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#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC."
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#endif
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#ifndef STBI_MALLOC
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#define STBI_MALLOC(sz) malloc(sz)
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#define STBI_REALLOC(p,sz) realloc(p,sz)
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#define STBI_FREE(p) free(p)
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#define STBI_MEMMOVE(a,b,sz) memmove(a,b,sz)
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#define STBI_MEMCPY(a,b,sz) memcpy(a,b,sz)
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#endif
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#ifndef STBI_ASSERT
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#include <assert.h>
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#define STBI_ASSERT(x) assert(x)
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#endif
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typedef unsigned int stbiw_uint32;
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typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
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@ -113,7 +139,7 @@ static void writefv(FILE *f, const char *fmt, va_list v)
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b[2]=(unsigned char)(x>>16); b[3]=(unsigned char)(x>>24);
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fwrite(b,4,1,f); break; }
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default:
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assert(0);
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STBI_ASSERT(0);
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return;
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}
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}
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@ -135,7 +161,7 @@ static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp,
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if (y <= 0)
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return;
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if (vdir < 0)
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if (vdir < 0)
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j_end = -1, j = y-1;
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else
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j_end = y, j = 0;
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@ -232,7 +258,7 @@ void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear)
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void stbiw__write_run_data(FILE *f, int length, unsigned char databyte)
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{
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unsigned char lengthbyte = (unsigned char) (length+128);
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assert(length+128 <= 255);
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STBI_ASSERT(length+128 <= 255);
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fwrite(&lengthbyte, 1, 1, f);
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fwrite(&databyte, 1, 1, f);
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}
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@ -240,7 +266,7 @@ void stbiw__write_run_data(FILE *f, int length, unsigned char databyte)
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void stbiw__write_dump_data(FILE *f, int length, unsigned char *data)
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{
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unsigned char lengthbyte = (unsigned char )(length & 0xff);
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assert(length <= 128); // inconsistent with spec but consistent with official code
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STBI_ASSERT(length <= 128); // inconsistent with spec but consistent with official code
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fwrite(&lengthbyte, 1, 1, f);
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fwrite(data, length, 1, f);
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}
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@ -320,7 +346,7 @@ void stbiw__write_hdr_scanline(FILE *f, int width, int comp, unsigned char *scra
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if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd
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// find next byte after run
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while (r < width && comp[r] == comp[x])
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++r;
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++r;
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// output run up to r
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while (x < r) {
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int len = r-x;
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@ -342,12 +368,12 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
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f = fopen(filename, "wb");
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if (f) {
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/* Each component is stored separately. Allocate scratch space for full output scanline. */
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unsigned char *scratch = (unsigned char *) malloc(x*4);
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unsigned char *scratch = (unsigned char *) STBI_MALLOC(x*4);
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fprintf(f, "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n" );
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fprintf(f, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n" , y, x);
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for(i=0; i < y; i++)
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stbiw__write_hdr_scanline(f, x, comp, scratch, data + comp*i*x);
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free(scratch);
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STBI_FREE(scratch);
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fclose(f);
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}
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return f != NULL;
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@ -367,13 +393,13 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
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#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v))
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#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0)
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#define stbiw__sbfree(a) ((a) ? free(stbiw__sbraw(a)),0 : 0)
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#define stbiw__sbfree(a) ((a) ? STBI_FREE(stbiw__sbraw(a)),0 : 0)
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static void *stbiw__sbgrowf(void **arr, int increment, int itemsize)
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{
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int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1;
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void *p = realloc(*arr ? stbiw__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
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assert(p);
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void *p = STBI_REALLOC(*arr ? stbiw__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
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STBI_ASSERT(p);
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if (p) {
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if (!*arr) ((int *) p)[1] = 0;
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*arr = (void *) ((int *) p + 2);
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@ -458,7 +484,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
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i=0;
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while (i < data_len-3) {
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// hash next 3 bytes of data to be compressed
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// hash next 3 bytes of data to be compressed
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int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3;
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unsigned char *bestloc = 0;
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unsigned char **hlist = hash_table[h];
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@ -471,7 +497,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
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}
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// when hash table entry is too long, delete half the entries
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if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) {
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memcpy(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
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STBI_MEMCPY(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
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stbiw__sbn(hash_table[h]) = quality;
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}
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stbiw__sbpush(hash_table[h],data+i);
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@ -494,7 +520,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
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if (bestloc) {
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int d = (int) (data+i - bestloc); // distance back
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assert(d <= 32767 && best <= 258);
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STBI_ASSERT(d <= 32767 && best <= 258);
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for (j=0; best > lengthc[j+1]-1; ++j);
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stbiw__zlib_huff(j+257);
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if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
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@ -535,7 +561,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
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}
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*out_len = stbiw__sbn(out);
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// make returned pointer freeable
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memmove(stbiw__sbraw(out), out, *out_len);
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STBI_MEMMOVE(stbiw__sbraw(out), out, *out_len);
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return (unsigned char *) stbiw__sbraw(out);
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}
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@ -582,8 +608,8 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
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if (stride_bytes == 0)
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stride_bytes = x * n;
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filt = (unsigned char *) malloc((x*n+1) * y); if (!filt) return 0;
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line_buffer = (signed char *) malloc(x * n); if (!line_buffer) { free(filt); return 0; }
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filt = (unsigned char *) STBI_MALLOC((x*n+1) * y); if (!filt) return 0;
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line_buffer = (signed char *) STBI_MALLOC(x * n); if (!line_buffer) { STBI_FREE(filt); return 0; }
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for (j=0; j < y; ++j) {
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static int mapping[] = { 0,1,2,3,4 };
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static int firstmap[] = { 0,1,0,5,6 };
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@ -622,20 +648,20 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
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}
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// when we get here, best contains the filter type, and line_buffer contains the data
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filt[j*(x*n+1)] = (unsigned char) best;
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memcpy(filt+j*(x*n+1)+1, line_buffer, x*n);
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STBI_MEMCPY(filt+j*(x*n+1)+1, line_buffer, x*n);
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}
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free(line_buffer);
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STBI_FREE(line_buffer);
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zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory
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free(filt);
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STBI_FREE(filt);
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if (!zlib) return 0;
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// each tag requires 12 bytes of overhead
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out = (unsigned char *) malloc(8 + 12+13 + 12+zlen + 12);
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out = (unsigned char *) STBI_MALLOC(8 + 12+13 + 12+zlen + 12);
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if (!out) return 0;
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*out_len = 8 + 12+13 + 12+zlen + 12;
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o=out;
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memcpy(o,sig,8); o+= 8;
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STBI_MEMCPY(o,sig,8); o+= 8;
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stbiw__wp32(o, 13); // header length
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stbiw__wptag(o, "IHDR");
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stbiw__wp32(o, x);
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@ -649,14 +675,14 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
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stbiw__wp32(o, zlen);
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stbiw__wptag(o, "IDAT");
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memcpy(o, zlib, zlen); o += zlen; free(zlib);
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STBI_MEMCPY(o, zlib, zlen); o += zlen; STBI_FREE(zlib);
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stbiw__wpcrc(&o, zlen);
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stbiw__wp32(o,0);
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stbiw__wptag(o, "IEND");
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stbiw__wpcrc(&o,0);
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assert(o == out + *out_len);
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STBI_ASSERT(o == out + *out_len);
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return out;
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}
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@ -668,16 +694,17 @@ int stbi_write_png(char const *filename, int x, int y, int comp, const void *dat
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unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len);
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if (!png) return 0;
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f = fopen(filename, "wb");
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if (!f) { free(png); return 0; }
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if (!f) { STBI_FREE(png); return 0; }
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fwrite(png, 1, len, f);
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fclose(f);
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free(png);
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STBI_FREE(png);
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return 1;
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}
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#endif // STB_IMAGE_WRITE_IMPLEMENTATION
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/* Revision history
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0.98 (2015-04-08)
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added STBI_MALLOC, STBI_ASSERT etc
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0.97 (2015-01-18)
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fixed HDR asserts, rewrote HDR rle logic
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0.96 (2015-01-17)
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